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प्रश्न
How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?
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उत्तर
Each ovary produces several immature eggs, which are connected with groups of other cells known as follicles. In humans, only one egg is usually removed at a time; however, two or more may emerge during the menstrual cycle. The egg emerges from the ovary between the 14th and 16th days of the typically 28-day menstrual cycle. Fertilisation of a single egg results in one zygote (monozygotic) that divides into two embryos, forming identical twins. If the twins were born fraternal, two eggs would be released. Fraternal twins (also known as non-identical twins) are typically formed when two fertilised eggs are implanted in the uterine wall at the same time. The two eggs produce two zygotes; hence, these twins are also known as dizygotic or binovular twins.
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संबंधित प्रश्न
Fill in the blank:
Lower part of uterus is called _________.
Fill in the blank:
The time between fertilisation and birth is called _________.
What happens in a girl’s body under the influence of hormones?
Name two hormones secreted by ovary of female reproductive system.
Name the two types of twins.
Mention the exact location of the following :
Corpus callosum
The diagram given below represents a system in the human body. Stud the diagram and answer the following questions:
Name the two hormones secreted by 1.
Name the following:
The separation of the foetus from the mother's body.
Complete the following sentences with appropriate word:
The female equivalent of the penis is the _______.
The largest cell in the human body of a female is ______.
Match the parts of the given figure with the correct option.
| 1 | 2 | 3 | 4 | 5 | |
| a. | Fallopian tube | Oviduct | Uterus | Cervix | Vagina |
| b. | Oviduct | Cervix | Vagina | Ovary | Vas deferens |
| c. | Ovary | Oviduct | Uterus | Vagina | Cervix |
| d. | Fallopian tube | Ovary | Cervix | Uterus | Vagina |
______ pollen mother cells should undergo meiotic division to produce 64 pollen grains.
______ is homologous to Bartholin's glands.
Identify the distal narrow part of the duct opening into the uterus.
Ovulation occurs under the influence of ______.
The estrus cycle is a characteristic of ______.
Bartholin’s glands are situated ______.
Figure A shows the front view of the human female reproductive system and Figure B shows the development of a fertilized human egg cell
Figure A
Figure B
Identify the correct stage of development of the human embryo (Figure B) that takes place at the sites X, Y, and Z respectively in the human female reproductive system (Figure A).
Choose the correct option from the table below:
| X | Y | Z | |
| A | Morula | Fertilized egg | Blastocyst |
| B | Unfertilized egg | Fertilized egg | Morula |
| C | Blastocyst | Fertilized egg | Unfertilized egg |
| D | Fertilized egg | Morula | Blastocyst |
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
Which structure in the ovary will remain functional in subject 2?
Which among the following is not the function of testes at puberty?
- formation of germ cells
- secretion of testosterone
- development of placenta
- secretion of estrogen
What are various ways to avoid pregnancy? Elaborate any one method.
The oviducts are also known as ______.
One mature ovum is released once every ______ days.
What is parturition?
With a suitable diagram, describe the organisation of mammary gland.
Bartholin's glands are homologous to ______.
The ______ is also called the womb.
Rewrite the terms in the correct order so as to be in a logical sequence.
Sperm duct, coitus, sperm, vagina, urethra.
Given below is a group of terms. In the group, one pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Leydig cells : Testosterone : ______ : Oestrogen.
